Description of problem:

In our CI we run repoclosure in parallel. We run it as a non-root user and all processes use the same cache directory in /var/tmp. The problem is that one repoclosure can delete the cache of another.

Suppose 2 process both have a repo named el7-epel and process 1 is done using it. Then it removes the cache, but process 2 could still be using it.

There is no way to force every process to use their own cache (other than doing filesystem tricks). It uses the getCacheDir() function from yum.misc but there's no way to pass in reuse=False to disable the problematic behavior.

Version-Release number of selected component (if applicable):

Seen in the latest in EL7 (yum-utils-1.1.31.45.el7) but probably present in all versions.


How reproducible:

Since it's a sort of race condition, it isn't 100% reproducible but it's pretty easy if you increase the concurrency.


Steps to Reproduce:
1. Start a number of repoclosure processes that use the same repositories in parallel. 

Actual results:

Sometimes you get errors like:

Traceback (most recent call last):
  File "/usr/bin/repoclosure", line 306, in <module>
    main()
  File "/usr/bin/repoclosure", line 260, in main
    my.readMetadata()
  File "/usr/bin/repoclosure", line 112, in readMetadata
    self.doRepoSetup()
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 681, in doRepoSetup
    return self._getRepos(thisrepo, True)
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 721, in _getRepos
    self._repos.doSetup(thisrepo)
  File "/usr/lib/python2.7/site-packages/yum/repos.py", line 157, in doSetup
    self.retrieveAllMD()
  File "/usr/lib/python2.7/site-packages/yum/repos.py", line 88, in retrieveAllMD
    dl = repo._async and repo._commonLoadRepoXML(repo)
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 1506, in _commonLoadRepoXML
    self._revertOldRepoXML()
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 1334, in _revertOldRepoXML
    os.rename(old_data['old_local'], old_data['local'])
OSError: [Errno 2] No such file or directory

Expected results:

Normal execution.

Additional info: